Adjustable air inlet manifold for combined fireplace grate and heating unit



FIG. 1 is a perspective view of an adjustable air inlet manifold, showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a bottom plan view, and

FIG. 6 is an end elevational view thereof.

The broken line representation of a combined fire place grate and heating unit in FIG. 1 is for purposes of illustration only. 

The ornamental design for an adjustable air inlet manifold, substantially as shown and described. 